Lighting - Revision history

Michel Lamontagne: /* Agriculture */

2023-01-06T04:27:50Z

Agriculture

← Older revision		Revision as of 05:27, 6 January 2023
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	This can be compared to the [[Food\|crop yields]] obtained on Earth, that vary between 10 and 50 t/ha for high yield crops. So although Mars surface greenhouses can work, the yield might be lower and supplemental lighting required for higher crop yields.		This can be compared to the [[Food\|crop yields]] obtained on Earth, that vary between 10 and 50 t/ha for high yield crops. So although Mars surface greenhouses can work, the yield might be lower and supplemental lighting required for higher crop yields.

			The use of [[hydroponics]] with artificial lighting and many layers of trays can increase yields in t/ha up to 600-2000 t/ha. https://www.freightfarms.com/

	==Lighting levels==		==Lighting levels==

Michel Lamontagne: /* Agriculture */

2023-01-06T03:41:53Z

Agriculture

← Older revision		Revision as of 04:41, 6 January 2023
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	Many plants require more sunlight than is available on the Martian surface. [[Dust storms]] can also obscure the sun for months at a time. Artificial lighting is needed to at least augment the natural light.		Many plants require more sunlight than is available on the Martian surface. [[Dust storms]] can also obscure the sun for months at a time. Artificial lighting is needed to at least augment the natural light.

	Interior grow rooms use artificial light for plant production. This technology was developed for the production of Cannabis in closed environments but is applicable to all indoor grown plants. The most common power used for these installations is 300-600 W/m2 of lighting, or about one quarter to one half the power of full sunlight.		Interior grow rooms use artificial light for plant production. This technology was developed for the production of Cannabis in closed environments and container farming but is applicable to all indoor grown plants. The most common power used for these installations is 300-600 W/m2 of lighting, or about one quarter to one half the power of full sunlight.

	Food production is a factor of the amount of illumination received by the plant. A useful equation for a surface greenhouse is:		Food production is a factor of the amount of illumination received by the plant. A useful equation for a surface greenhouse is:

Michel Lamontagne: /* Agriculture */

2023-01-06T02:13:32Z

Agriculture

← Older revision		Revision as of 03:13, 6 January 2023
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	For 260 days of production per year the yield would be 1.7 kg/m2 per year, or about 17 t/ha.		For 260 days of production per year the yield would be 1.7 kg/m2 per year, or about 17 t/ha.

	This can be compared to the [[Food\|crop yields]] obtained on Earth, that vary between 20 and ~~100~~ t/ha for high yield crops. So although Mars surface greenhouses can work, the yield might be ~~relatively low~~ and supplemental lighting required for higher crop yields.		This can be compared to the [[Food\|crop yields]] obtained on Earth, that vary between 10 and 50 t/ha for high yield crops. So although Mars surface greenhouses can work, the yield might be lower and supplemental lighting required for higher crop yields.

	==Lighting levels==		==Lighting levels==

Michel Lamontagne: /* Agriculture */

2023-01-06T02:11:35Z

Agriculture

← Older revision		Revision as of 03:11, 6 January 2023
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	For 260 days of production per year the yield would be 1.7 kg/m2 per year, or about 17 t/ha.		For 260 days of production per year the yield would be 1.7 kg/m2 per year, or about 17 t/ha.

	This can be compared to the [[Food\|crop yields]] obtained on Earth, that vary between 3 and ~~400~~ t/ha for high yield crops. So although Mars surface greenhouses can work, the yield might be relatively low and supplemental lighting required for higher crop yields.		This can be compared to the [[Food\|crop yields]] obtained on Earth, that vary between 20 and 100 t/ha for high yield crops. So although Mars surface greenhouses can work, the yield might be relatively low and supplemental lighting required for higher crop yields.

	==Lighting levels==		==Lighting levels==

Michel Lamontagne: /* Agriculture */

2021-04-16T02:07:45Z

Agriculture

← Older revision		Revision as of 03:07, 16 April 2021
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	===Agriculture===		===Agriculture===

	Many plants require more sunlight than is available on the ~~martian~~ surface. [[Dust storms]] can also obscure the sun for months at a time. Artificial lighting is needed to at least augment the natural light.		Many plants require more sunlight than is available on the Martian surface. [[Dust storms]] can also obscure the sun for months at a time. Artificial lighting is needed to at least augment the natural light.

	Interior grow rooms use artificial light for plant production. This technology was developed for the production of Cannabis in closed environments but is applicable to all indoor grown plants. The most common power used for these installations is 300-600 W/m2, or about one quarter to one half the power of full sunlight.		Interior grow rooms use artificial light for plant production. This technology was developed for the production of Cannabis in closed environments but is applicable to all indoor grown plants. The most common power used for these installations is 300-600 W/m2 of lighting, or about one quarter to one half the power of full sunlight.

	Food production is a factor of the amount of illumination received by the plant. A useful equation for a surface greenhouse is:		Food production is a factor of the amount of illumination received by the plant. A useful equation for a surface greenhouse is:

Michel Lamontagne at 16:28, 6 November 2020

2020-11-06T16:28:29Z

← Older revision		Revision as of 17:28, 6 November 2020
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	For a greenhouse with a transmittance of 0,8, food production might be (.77 x 20.8 x .8)-6.1 = 6.7 g/m2/day		For a greenhouse with a transmittance of 0,8, food production might be (.77 x 20.8 x .8)-6.1 = 6.7 g/m2/day

	For 260 days of production per year the yield would be 1.7 kg/m2 per year, or about 17 ~~tonnes per hectare~~.		For 260 days of production per year the yield would be 1.7 kg/m2 per year, or about 17 t/ha.

			This can be compared to the [[Food\|crop yields]] obtained on Earth, that vary between 3 and 400 t/ha for high yield crops. So although Mars surface greenhouses can work, the yield might be relatively low and supplemental lighting required for higher crop yields.

	==Lighting levels==		==Lighting levels==

Michel Lamontagne: /* Agriculture */

2020-11-06T16:24:04Z

Agriculture

← Older revision		Revision as of 17:24, 6 November 2020
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	Interior grow rooms use artificial light for plant production. This technology was developed for the production of Cannabis in closed environments but is applicable to all indoor grown plants. The most common power used for these installations is 300-600 W/m2, or about one quarter to one half the power of full sunlight.		Interior grow rooms use artificial light for plant production. This technology was developed for the production of Cannabis in closed environments but is applicable to all indoor grown plants. The most common power used for these installations is 300-600 W/m2, or about one quarter to one half the power of full sunlight.

			Food production is a factor of the amount of illumination received by the plant. A useful equation for a surface greenhouse is:

			Edible food=0.77 x PAR x T-6.1 (reference needed) where:

			Edible food= Amount of edible plant mass produced (g/m2/day)

			PAR= lighting level of photosynthetically active radiation. On Mars for natural lighting it is 20.8 (mol/m2/day).

			T= transmittance of greenhouse surface.

			For a greenhouse with a transmittance of 0,8, food production might be (.77 x 20.8 x .8)-6.1 = 6.7 g/m2/day

			For 260 days of production per year the yield would be 1.7 kg/m2 per year, or about 17 tonnes per hectare.

	==Lighting levels==		==Lighting levels==

Michel Lamontagne at 02:39, 26 December 2019

2019-12-26T02:39:06Z

← Older revision		Revision as of 03:39, 26 December 2019
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	'''Lighting''' is vital for a colony. A colony ~~might~~ have a limited number of windows, so lighting ~~would~~ be required ~~permanently~~. [[Plants]] in [[greenhouse\|greenhouses]] ~~might~~ need to be lit artificially to supplement natural light. [[Rover\|Rovers]] must have headlamps for driving at night or during [[dust storms]].		'''Lighting''' is vital for a colony. A colony will have a limited number of windows, so artificial lighting may be required at all times. [[Plants]] in [[greenhouse\|greenhouses]] will probably need to be lit artificially to supplement natural light. [[Rover\|Rovers]] must have headlamps for driving at night or during [[dust storms]].


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	===Health===		===Health===
	The proper wavelengths of light are needed by [[human\|humans]] to produce [[Vitamins\|Vitamin D]].		The proper wavelengths of light are needed by [[human\|humans]] to produce [[Vitamins\|Vitamin D]]. On Earth, about 15 minutes under the noon sun, 3 times a week, is enough to produce the required vitamin D.<ref>https://www.healthline.com/nutrition/vitamin-d-from-sun#time-of-day</ref> On Mars, the exposure time would need to be longer. Most type of glass screen ultraviolet light, so exposure under glass would not produce vitamin D. Using ultraviolet light from artificial sources would product the same effect as the sun.

	Certain lights, emulating natural sunlight, are used to treat [[Seasonal affective disorder\|Seasonal Affective Disorder]].		Certain lights, emulating natural sunlight, are used to treat [[Seasonal affective disorder\|Seasonal Affective Disorder]].
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	\|}		\|}

	~~==Open Issues==~~		==References==

	*How much exposure time is needed for the skin to produce enough vitamin D?

	== References ==
	[[Category:Construction, Assembly, Maintenance]]		[[Category:Construction, Assembly, Maintenance]]
	<references />		<references />

Michel Lamontagne at 04:01, 23 December 2019

2019-12-23T04:01:30Z

← Older revision		Revision as of 05:01, 23 December 2019
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	Most light bulbs on Earth were incandescent until recently. Due to their relatively low efficiency, incandescent lights are being phased out all over the world.<ref>https://en.wikipedia.org/wiki/Phase-out_of_incandescent_light_bulbs</ref> In most commercial installation incandescent light bulbs have been replaced by fluorescents, that are themselves being replaced by LEDs.		Most light bulbs on Earth were incandescent until recently. Due to their relatively low efficiency, incandescent lights are being phased out all over the world.<ref>https://en.wikipedia.org/wiki/Phase-out_of_incandescent_light_bulbs</ref> In most commercial installation incandescent light bulbs have been replaced by fluorescents, that are themselves being replaced by LEDs.

	~~Fire and stars produce~~ light ~~via incandescence~~. In an incandescent light-bulb a metal filament (Usually [[tungsten]], the ~~only metal that can withstand the temperatures~~) is heated to around 3000C. A [[glass]] bulb is fitted around the filament and the air evacuated or replaced by an inert gas, because the filament would otherwise oxidize and burn.		Incandescence is a term usually reserved for a solid that emits light as it is heated. In an incandescent light-bulb a metal filament (Usually [[tungsten]], but carbon has also been used in the past,) is heated to around 3000C. A [[glass]] or quartz bulb is fitted around the filament and the air evacuated or replaced by an inert gas, because the filament would otherwise oxidize and burn.
			===Halogen===
			Halogen light are a variation on incandescent lights, where the filament can last longer due to chemical interactions between the tungsten element and the halogen gas in the bulb.

	===Fluorescent===		===Fluorescent===
			Fluorescent lights use a phosphorous coating inside the lamp tube to transform the ultraviolet light emitted by an ionised plasma in the tube into visible light.

	===~~Halogen===~~		===Light Emitting Diode (LED)===
			[[Light emitting diode\|LED]] are [[energy]] efficient, and produce little heat compared to incandescent, fluorescent, and halogen lights. They use the light emitted from a semi conductor in visible wavelengths and combine red green and blue components to produce white light.<ref>https://en.wikipedia.org/wiki/Light-emitting_diode</ref>
	~~===~~LED===
	[[Light emitting diode\|LED]] are [[energy]] efficient, and produce little heat compared to incandescent, fluorescent, and halogen ~~bulbs~~.

	~~===BioLEDS===~~		LEDs in 2019 can produce about 220 lumens per watt, while incandescent light bulbs produce only about 14 lumens per watt and fluorescents 80 lumens per watt.<ref>https://greatercea.org/lightbulb-efficiency-comparison-chart/</ref>

	==Human response to light==		==Human response to light==
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	*How much exposure time is needed for the skin to produce enough vitamin D?		*How much exposure time is needed for the skin to produce enough vitamin D?

			== References ==
	[[Category:Construction, Assembly, Maintenance]]		[[Category:Construction, Assembly, Maintenance]]
	<references />		<references />

Michel Lamontagne: /* Incandescent */

2019-12-22T20:01:37Z

Incandescent

← Older revision		Revision as of 21:01, 22 December 2019
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	===Incandescent===		===Incandescent===
	Most ~~lightbulbs~~ on Earth were incandescent until recently. Fire and stars produce light via incandescence. In an incandescent light-bulb a metal filament (Usually [[tungsten]], the only metal that can withstand the temperatures) is heated to around 3000C. A [[glass]] bulb is fitted around the filament and the air evacuated or replaced by an inert gas, because the filament would otherwise oxidize and burn. In most commercial installation incandescent light bulbs have been replaced by fluorescents, that are themselves being replaced by LEDs. Incandescent lights are being phased out all over the world.<ref>https://en.wikipedia.org/wiki/Phase-out_of_incandescent_light_bulbs</ref>		Most light bulbs on Earth were incandescent until recently. Due to their relatively low efficiency, incandescent lights are being phased out all over the world.<ref>https://en.wikipedia.org/wiki/Phase-out_of_incandescent_light_bulbs</ref> In most commercial installation incandescent light bulbs have been replaced by fluorescents, that are themselves being replaced by LEDs.

			Fire and stars produce light via incandescence. In an incandescent light-bulb a metal filament (Usually [[tungsten]], the only metal that can withstand the temperatures) is heated to around 3000C. A [[glass]] bulb is fitted around the filament and the air evacuated or replaced by an inert gas, because the filament would otherwise oxidize and burn.
	===Fluorescent===		===Fluorescent===